| 1 | /*
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| 2 | * get_pathname.c --- do directry/inode -> name translation
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| 3 | *
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| 4 | * Copyright (C) 1993, 1994, 1995 Theodore Ts'o.
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| 5 | *
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| 6 | * %Begin-Header%
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| 7 | * This file may be redistributed under the terms of the GNU Public
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| 8 | * License.
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| 9 | * %End-Header%
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| 10 | *
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| 11 | * ext2fs_get_pathname(fs, dir, ino, name)
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| 12 | *
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| 13 | * This function translates takes two inode numbers into a
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| 14 | * string, placing the result in <name>. <dir> is the containing
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| 15 | * directory inode, and <ino> is the inode number itself. If
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| 16 | * <ino> is zero, then ext2fs_get_pathname will return pathname
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| 17 | * of the the directory <dir>.
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| 18 | *
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| 19 | */
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| 20 |
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| 21 | #include <stdio.h>
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| 22 | #include <string.h>
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| 23 | #if HAVE_UNISTD_H
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| 24 | #include <unistd.h>
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| 25 | #endif
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| 26 |
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| 27 | #include "ext2_fs.h"
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| 28 | #include "ext2fs.h"
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| 29 |
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| 30 | struct get_pathname_struct {
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| 31 | ext2_ino_t search_ino;
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| 32 | ext2_ino_t parent;
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| 33 | char *name;
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| 34 | errcode_t errcode;
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| 35 | };
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| 36 |
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| 37 | #ifdef __TURBOC__
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| 38 | # pragma argsused
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| 39 | #endif
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| 40 | static int get_pathname_proc(struct ext2_dir_entry *dirent,
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| 41 | int offset EXT2FS_ATTR((unused)),
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| 42 | int blocksize EXT2FS_ATTR((unused)),
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| 43 | char *buf EXT2FS_ATTR((unused)),
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| 44 | void *priv_data)
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| 45 | {
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| 46 | struct get_pathname_struct *gp;
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| 47 | errcode_t retval;
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| 48 |
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| 49 | gp = (struct get_pathname_struct *) priv_data;
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| 50 |
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| 51 | if (((dirent->name_len & 0xFF) == 2) &&
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| 52 | !strncmp(dirent->name, "..", 2))
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| 53 | gp->parent = dirent->inode;
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| 54 | if (dirent->inode == gp->search_ino) {
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| 55 | retval = ext2fs_get_mem((dirent->name_len & 0xFF) + 1,
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| 56 | &gp->name);
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| 57 | if (retval) {
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| 58 | gp->errcode = retval;
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| 59 | return DIRENT_ABORT;
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| 60 | }
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| 61 | strncpy(gp->name, dirent->name, (dirent->name_len & 0xFF));
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| 62 | gp->name[dirent->name_len & 0xFF] = '\0';
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| 63 | return DIRENT_ABORT;
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| 64 | }
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| 65 | return 0;
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| 66 | }
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| 67 |
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| 68 | static errcode_t ext2fs_get_pathname_int(ext2_filsys fs, ext2_ino_t dir,
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| 69 | ext2_ino_t ino, int maxdepth,
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| 70 | char *buf, char **name)
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| 71 | {
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| 72 | struct get_pathname_struct gp;
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| 73 | char *parent_name, *ret;
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| 74 | errcode_t retval;
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| 75 |
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| 76 | if (dir == ino) {
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| 77 | retval = ext2fs_get_mem(2, name);
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| 78 | if (retval)
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| 79 | return retval;
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| 80 | strcpy(*name, (dir == EXT2_ROOT_INO) ? "/" : ".");
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| 81 | return 0;
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| 82 | }
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| 83 |
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| 84 | if (!dir || (maxdepth < 0)) {
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| 85 | retval = ext2fs_get_mem(4, name);
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| 86 | if (retval)
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| 87 | return retval;
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| 88 | strcpy(*name, "...");
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| 89 | return 0;
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| 90 | }
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| 91 |
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| 92 | gp.search_ino = ino;
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| 93 | gp.parent = 0;
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| 94 | gp.name = 0;
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| 95 | gp.errcode = 0;
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| 96 |
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| 97 | retval = ext2fs_dir_iterate(fs, dir, 0, buf, get_pathname_proc, &gp);
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| 98 | if (retval)
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| 99 | goto cleanup;
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| 100 | if (gp.errcode) {
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| 101 | retval = gp.errcode;
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| 102 | goto cleanup;
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| 103 | }
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| 104 |
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| 105 | retval = ext2fs_get_pathname_int(fs, gp.parent, dir, maxdepth-1,
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| 106 | buf, &parent_name);
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| 107 | if (retval)
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| 108 | goto cleanup;
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| 109 | if (!ino) {
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| 110 | *name = parent_name;
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| 111 | return 0;
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| 112 | }
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| 113 |
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| 114 | if (gp.name)
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| 115 | retval = ext2fs_get_mem(strlen(parent_name)+strlen(gp.name)+2,
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| 116 | &ret);
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| 117 | else
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| 118 | retval = ext2fs_get_mem(strlen(parent_name)+5, &ret);
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| 119 | if (retval)
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| 120 | goto cleanup;
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| 121 |
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| 122 | ret[0] = 0;
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| 123 | if (parent_name[1])
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| 124 | strcat(ret, parent_name);
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| 125 | strcat(ret, "/");
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| 126 | if (gp.name)
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| 127 | strcat(ret, gp.name);
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| 128 | else
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| 129 | strcat(ret, "???");
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| 130 | *name = ret;
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| 131 | ext2fs_free_mem(&parent_name);
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| 132 | retval = 0;
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| 133 |
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| 134 | cleanup:
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| 135 | ext2fs_free_mem(&gp.name);
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| 136 | return retval;
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| 137 | }
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| 138 |
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| 139 | errcode_t ext2fs_get_pathname(ext2_filsys fs, ext2_ino_t dir, ext2_ino_t ino,
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| 140 | char **name)
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| 141 | {
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| 142 | char *buf;
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| 143 | errcode_t retval;
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| 144 |
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| 145 | EXT2_CHECK_MAGIC(fs, EXT2_ET_MAGIC_EXT2FS_FILSYS);
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| 146 |
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| 147 | retval = ext2fs_get_mem(fs->blocksize, &buf);
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| 148 | if (retval)
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| 149 | return retval;
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| 150 | if (dir == ino)
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| 151 | ino = 0;
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| 152 | retval = ext2fs_get_pathname_int(fs, dir, ino, 32, buf, name);
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| 153 | ext2fs_free_mem(&buf);
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| 154 | return retval;
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| 155 |
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| 156 | }
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